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How is Generic Covariance & Contra-variance Implemented in C# 4.0?
...t I heard some news that C# 4.0 is announced to support Generic covariance and contra-variance. That is, List<string> can be assigned to List<object> . How could that be?
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Get distance between two points in canvas
I have canvas drawing tab and want lineWidth to be based on distance between two last mousemove coordinate updates. I will make translation of distance to width myself, I just need to know how to get distance between those points (I already have coordinates of those pointes).
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How to randomly sort (scramble) an array in Ruby?
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And if you want to implement it yourself: en.wikipedia.org/wiki/Fisher-Yates_shuffle
– Joey
Nov 29 '09 at 18:52
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SQL Server Linked Server Example Query
...:
DatabaseServer1.db1.dbo.table1
Update: I know this is an old question and the answer I have is correct; however, I think any one else stumbling upon this should know a few things.
Namely, when querying against a linked server in a join situation the ENTIRE table from the linked server will lik...
What is that “total” in the very first line after ls -l? [closed]
...m does not mention that line, but info coreutils ls does. How comes man ls and info coreutils ls have different information about the same command? Why isn't ls just documented once? Having two different documentations for the same command seems like set up for failure.
– Hello...
For every character in string
...loop (it's from C++11, already supported in recent releases of GCC, clang, and the VC11 beta):
std::string str = ???;
for(char& c : str) {
do_things_with(c);
}
Looping through the characters of a std::string with iterators:
std::string str = ???;
for(std::string::iterator it = str.begin()...
Why is '397' used for ReSharper GetHashCode override?
...397 is a prime of sufficient size to cause the result variable to overflow and mix the bits of the hash somewhat, providing a better distribution of hash codes. There's nothing particularly special about 397 that distinguishes it from other primes of the same magnitude.
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How to get the first line of a file in a bash script?
... a bash variable the first line of a file. I guess it is with the grep command, but it is any way to restrict the number of lines?
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windows batch SET inside IF not working
...y.
Therefore the delayedExpansion syntax exists, it uses ! instead of % and it is evaluated at execution time, not parse time.
Please note that in order to use !, the additional statement setlocal EnableDelayedExpansion is needed.
setlocal EnableDelayedExpansion
set var1=true
if "%var1%"=="true...
Formatting a number with exactly two decimals in JavaScript
...cation (ECMA402). It has pretty good browser support, including even IE11, and it is fully supported in Node.js.
const formatter = new Intl.NumberFormat('en-US', {
minimumFractionDigits: 2,
maximumFractionDigits: 2,
});
console.log(formatter.format(2.005)); // "2.01"
console.log(for...